KR102496189B1 - Shell type temporary crown automatic manufacturing apparatus, method, and program - Google Patents

Abstract

Disclosed is an apparatus for automatically preparing shell-type temporary crown, which comprises: a selection and input unit receiving a selected and inputted patient and a tooth to be treated of the patient; a scan data acquisition unit retrieving the intraoral 3D scan data of the patient selected and inputted in the selection and input unit; a segmentation and extraction unit performing segmentation for each tooth from the intraoral 3D scan data by using an artificial intelligence (AI) segmentation model and extracting and providing the shape data for the tooth to be treated; an automatic design unit automatically designing a file for 3D printing of the shell-type temporary crown by using the shape data for the tooth to be treated; and a 3D printing output unit outputting and transmitting the file for 3D printing to a 3D printer. Accordingly, the temporary crown can be prepared without conventional cumbersome manual work by a skilled one and the shape precision of a final product can be enhanced.

Description

Shell type temporary crown automatic manufacturing apparatus, method, and program

The present invention relates to an automatic shell-type temporary crown manufacturing apparatus, method, and program, and more particularly, to a technique for automatically manufacturing a shell-type temporary crown using an artificial intelligence segmentation model and an automatic design algorithm.

Here, the shell type temporary crown is a permanent prosthesis on the tooth of a patient in need of prosthetic treatment. As a type of temporary tooth manufactured and used to perform, it refers to a temporary object that is manufactured in a hollow shell shape and is simply covered on the tooth to be treated (abutment tooth) and temporarily fixed with an adhesive or the like.

BACKGROUND ART When a tooth is damaged for various reasons, prosthetic treatment is widely performed in which an artificial prosthesis called a crown is fabricated and covered with gold or the like on a tooth to be treated.

At this time, the process of manufacturing the crown, which functions as a permanent prosthesis, is performed in a laboratory outside the dental clinic, and it takes about one week until it is delivered to the dental office after production and fixed to the patient's tooth to be treated. A temporary tooth (crown) that can perform the role of a crown is needed.

These temporary teeth are manually manufactured by skilled professionals inside the dental office. This process uses amorphous resin, which is generally called self-curing resin, which is soft at first and then hardens over time, to make the necessary shape directly and insert it on the patient's tooth to be treated. It is a very cumbersome task to match.

In order to solve the inconvenience of the manual process of manufacturing temporary teeth, sets of standardized temporary teeth having various shapes and sizes are prepared in advance, and temporary teeth having appropriate shapes and sizes are selected from among them to reduce the inconvenience. The technology to reduce manual work is disclosed.

Among them, in Patent Document 1, a biodegradable polymer resin that softens at 50 to 90 ° C forms a body, and a hollow part is formed inside the body, and the body includes the occlusal surface of the teeth, the outer shape of the teeth, the length of the crown, and the crown. A technique of preparing in advance a set of temporary resin-based crowns standardized by the proximal distal endoscope, the proximal distal endoscope of the cervical region, and the labial and buccal lingual speculum of the crown is disclosed.

However, the size and shape of the teeth of various patients are all different, and there is no choice but to standardize them, so a fundamental problem remains in the prior art as above.

On the other hand, research on a technology utilizing a computer for the design or processing of a dental prosthesis, which is performed manually, has recently been actively conducted.

In particular, as in Patent Literature 2 to Patent Literature 4, attempts have been made to scan the patient's oral cavity using an intraoral scanner and digitally design a dental prosthesis using the scanned 3D scan image data, but this is also Since a prosthesis is designed by a professional through manual drawing using a CAD program, etc., the design quality of the prosthesis depends on the ability of the worker, and the problem of having to separately hire a professional designer still remains.

Korean Patent Registration No. 10-1445524 Korean Registered Patent Publication No. 10-1854732 Korean Patent Publication No. 10-2016-0011322 Korean Registered Patent Publication No. 10-1635998

The present invention has been made to solve the above problems in the prior art, and an object of the present invention is to provide an apparatus and method for automatically manufacturing a shell-type temporary crown using an artificial intelligence segmentation model and an automatic design algorithm.

In addition, another object of the present invention is to provide a program for performing a method for automatically manufacturing the shell type temporary crown as described above.

The problem to be solved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. will be.

In order to achieve the above object, an automatic shell-type temporary crown manufacturing apparatus according to an embodiment of the present invention includes a selection input unit for selecting and receiving a patient and a tooth to be treated of the patient; a scan data acquisition unit that reads intraoral 3D scan data of the patient selected and input to the selection input unit; a segmentation and extraction unit performing segmentation for each tooth in the intraoral 3D scan data using an artificial intelligence (AI) segmentation model, and extracting and providing shape data of the tooth to be treated; an automatic design unit that automatically designs a file for 3D output of a shell-type temporary crown by utilizing the shape data of the tooth to be treated; and a 3D printing output unit outputting and transmitting the 3D output file to a 3D printer.

In the above embodiment, it is preferable that the intraoral 3D scan data is intraoral 3D scan data before a PREP operation is performed.

In addition, in the above embodiment, the segmentation and extraction unit performs segmentation for each tooth using an artificial intelligence segmentation model from the intraoral 3D scan data, and separates data for each tooth separated by area from the entire intraoral 3D scan data It is preferable to store the data as a 3D mesh data file and extract and provide only the shape data of the tooth to be treated.

In addition, in the above embodiment, the automatic design unit sets the outer surface to the outer surface of the shell-type temporary crown from the shape data of the tooth to be treated, creates a shape reduced by a set thickness from the outer surface, and sets it to the inner surface, , It is preferable to set a shoulder connecting the exposed end of each of the outer and inner surfaces, combine the outer surface, inner surface, and shoulder to create a single 3D image, and convert the 3D image to create a 3D output file. do.

In addition, in the above embodiment, it is preferable to automatically supplement the curvature of the surface by applying a data correction algorithm to a severely curved portion of the outer surface of the shell-type temporary crown.

Meanwhile, a method for automatically manufacturing a shell-type temporary crown according to another embodiment of the present invention is a method for automatically manufacturing a shell-type temporary crown using the automatic manufacturing device for a shell-type temporary crown described in any one of the above embodiments. an input step of selecting and receiving an input of a patient and a tooth to be treated of the patient; an acquisition step of importing 3D scan data within the oral cavity of the patient selected and input in the input step; A separation extraction step of performing segmentation for each tooth in the intraoral 3D scan data called in the acquisition step by using an artificial intelligence (AI) segmentation model, and extracting and providing shape data of the tooth to be treated; an automatic design step of automatically designing a file for 3D output of a shell-type temporary crown by utilizing the shape data of the tooth to be treated; and an output step of outputting and transmitting the 3D output file to a 3D printer.

In the above embodiment, the intraoral 3D scan data is preferably intraoral 3D scan data before performing a PREP operation.

In addition, in the above embodiment, the separation and extraction step performs segmentation for each tooth using an artificial intelligence segmentation model from the intraoral 3D scan data, and separates the region-divided tooth data from the entire intraoral 3D scan data and storing it as a 3D mesh data file, and extracting and providing only the shape data of the tooth to be treated.

In addition, in the above embodiment, in the automatic design step, the outer surface is set as the outer surface of the shell-type temporary crown from the shape data of the tooth to be treated, and a shape reduced by a set thickness is created from the outer surface and set as the inner surface. And, setting a shoulder connecting the exposed end of each of the outer and inner surfaces, combining the outer surface, inner surface, and shoulder to create a single 3D image, and converting the 3D image to create a 3D output file. It is preferable to include.

In addition, in the above embodiment, it is preferable to further include automatically supplementing the curvature of the surface by applying a data correction algorithm to a severely curved portion of the outer surface of the shell-type temporary crown.

On the other hand, the automatic shell-type temporary crown manufacturing program according to another embodiment of the present invention is combined with a computer, which is hardware, and stored in a medium to execute the automatic shell-type temporary crown manufacturing method.

When using the device and method for automatically manufacturing a shell-type temporary crown according to the present invention having the above configuration, the shell-type temporary crown can be fully automatically manufactured using an artificial intelligence segmentation model and an automatic design algorithm, When manufacturing teeth, cumbersome manual work by skilled experts and the like in the prior art is not required.

In addition, in the present invention, by utilizing 3D scan data in the oral cavity before performing the prep work, after the prep work, taking an impression or performing a 3D scan work in the oral cavity and using the result to manufacture temporary teeth Compared to the conventional method, the total working time can be shortened.

In addition, since the shape design of the actual use state of the tooth to be treated can be acquired and utilized as it is, not after the tooth has been deleted according to the preparation work, the shape precision of the final product can be increased.

1 is a schematic configuration diagram of an automatic shell-type temporary crown manufacturing apparatus according to an embodiment of the present invention;
Figure 2 is an explanatory diagram explaining the function of the segmentation and extraction unit shown in Figure 1 step by step;
3 is an explanatory view showing the shape of an automatically designed shell-type temporary crown by way of example;
4 is a cross-sectional view of each component of a shell-type temporary crown;
5 is a conceptual diagram of a surface curvature correction algorithm of a shell-type temporary crown;
6 is a flowchart of a method for automatically manufacturing a shell-type temporary crown according to an embodiment of the present invention.

Hereinafter, specific embodiments in which the present invention may be practiced will be described in detail by way of example. These embodiments are described in sufficient detail to enable one skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different from each other but are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in one embodiment in another embodiment without departing from the spirit and scope of the present invention. Accordingly, the detailed description set forth below is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all equivalents as claimed by those claims.

First, an apparatus for automatically manufacturing a shell-type temporary crown according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of an automatic shell-type temporary crown manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram explaining the functions of the segmentation and extraction unit shown in FIG. 1 step by step.

As schematically shown in FIG. 1, the automatic shell-type temporary crown manufacturing apparatus 100 according to an embodiment of the present invention includes a selection input unit 10, a scan data acquisition unit 20, a segmentation and extraction unit 30 ), an automatic design unit 40, and a 3D printing output unit 50.

The selection input unit 10 is a means for selecting and receiving a target to manufacture a shell-type temporary crown, and can select and input a tooth to be treated that requires prosthetic treatment among a specific patient and the patient's teeth.

The identification of the patient can be identified using various identification codes currently used by dentists or related service companies, such as the patient's name and date of birth. In addition, it is preferable that the selection of the tooth to be treated is simply performed using a tooth identification number, i.e., a tooth formula.

The 3D scan data acquisition unit 20 is a means for calling intraoral scan data of a specific patient input through the selection input unit 10, and retrieves data from an intraoral 3D scan data database (DB) prepared in advance for each patient. Loads the 3D scan data of the selected patient's oral cavity. The intraoral 3D scan data stored in the DB is preferably obtained by a dentist or the like who performs face-to-face treatment with the patient by an intraoral 3D scanner, etc., and stored together with a patient identification code, so that it can be used if necessary. .

The intraoral 3D scan data is in the oral cavity before performing a PREP operation to form an abutment tooth by thinly removing the outer surface of the tooth so that a crown can be placed on and fixed to the tooth to be treated requiring crown treatment. It is preferable that it is 3D scan data.

A 3D scan inside the oral cavity of the patient who visited the dentist is performed first, and then a shell-type temporary crown is made using the intraoral scan data of the patient obtained in advance while the dentist etc. perform the preparation work on the patient's tooth. This is to shorten the overall work time by automatically manufacturing first and proceeding with the attachment work of the shell-type temporary crown immediately after the preparation work by the doctor is finished. This is because such an operation can be omitted compared to the conventional method of taking an impression or performing a 3D scanning operation in the oral cavity after the preparation operation and using the result to manufacture temporary teeth.

In addition, since the shape design of the actual use state of the tooth to be treated can be acquired and utilized as it is, not after the tooth has been deleted according to the preparation work, the shape precision of the final product can be increased.

The segmentation and extraction unit 30 searches for a target tooth to be treated selected from the 3D scan data in the oral cavity of the patient called by the 3D scan data acquisition unit 20, preferably, the 3D scan data in the oral cavity before the preparation operation. Then, it is a component that separates and extracts only the treatment target tooth area data. In other words, the segmentation and extraction unit 30 separates and extracts only the 3D surface data of the outer surface of the tooth to which the crown is to be applied and provides it.

Search and segmentation of the teeth selected as above may be performed manually by an operator or automatically by utilizing artificial intelligence or the like. In the present invention, it is characterized in that search and segmentation of a specific tooth is automatically performed from 3D scan data in the oral cavity of a patient by using an artificial intelligence (AI) segmentation model.

Accordingly, as shown exemplarily in FIG. 2 , the segmentation and extraction unit 30 performs segmentation for each tooth by utilizing an AI segmentation model from the obtained intraoral 3D scan data, and uses a 3D mesh data tool. 3D scan data in the entire oral cavity, data for each tooth separated by region is separated and stored as a separate 3D mesh data file. will do

Among them, automatic segmentation using an artificial intelligence segmentation model, that is, a technology for separating each tooth part for each tooth, will be described in more detail. The artificial intelligence (AI) segmentation model includes data collection and refinement, data labeling, and AI It can be prepared through the model learning phase.

First, a sufficient number of intraoral 3D scan data for each patient is collected and refined so that segmentation for each tooth of various patients can be properly performed.

Next, in the data labeling step, after confirming the collected data and converting it into an appropriate format, a skilled expert classifies each tooth in the intraoral 3D scan image data for each patient and paints it in a different color. Prepare data for AI model learning by attaching tooth number (tooth formula) information to The data labeling is preferably performed in such a way that each tooth is classified and painted in a different color, the center position is displayed, and the location and tooth number of each tooth are stored in a JSON file, for example.

Finally, in the AI model learning step, a point-cloud based or mesh data based segmentation model is trained using the data labeled in the previous step for segmentation that automatically classifies and separates each tooth. . Examples of point-cloud based models include PointNet, PointNet++, KPConv, DGCNN, and PointCNN, and examples of mesh data based models include MeshCNN and MeshSegNet. The learning results for each model can be compared and evaluated with various performance indicators.

As such, in the present invention, since learning is performed using the differentiated areas of teeth and tooth numbers, the AI segmentation model can classify individual tooth areas and identify each tooth number when given any 3D scan data in the future. do.

The automatic design unit 40 is a component that automatically designs a file for 3D output of a shell-type temporary crown by utilizing the shape data of the tooth to be treated, and separates and extracts data from the segmentation and extraction unit 30, in other words. Utilizing the 3D surface data of the outer surface of the tooth to be treated to which the crown is to be applied, the design file for outputting the shell-type temporary crown through a 3D printer is automatically designed.

3 is an explanatory diagram showing the shape of the automatically designed shell-type temporary crown as an example, FIG. 4 is a cross-sectional view of each component of the shell-type temporary crown, and FIG. 5 is a surface curvature correction algorithm of the shell-type temporary crown. It is a conceptual explanation.

As can be seen from the shape viewed from various directions shown in FIG. 3, the shell-type temporary crown has a thin shell-type crown shape with an empty middle part as a whole, and has an outer surface corresponding to the outer surface of the tooth and a certain thickness. It is made by connecting the inner surface of the shape reduced inward from the outer surface and the shoulder connecting each open boundary line of the outer and inner surfaces.

The automatic design process of the shell type temporary crown having such a shape is performed through the following 5 steps.

First, the outer surface of the tooth to be treated is set as the outer surface of the shell-type crown from the shape data of the tooth to be treated to which the separated and extracted crown is to be applied.

At this time, if there is a severely curved part, such as the matching surface of a tooth, the part that may cause problems when outputting from a 3D printer in the future due to the curvature of the narrow surface is applied to the 3D printer by applying a data correction algorithm based on the surrounding pixels. It is desirable to set to automatically compensate for the curvature of the surface so that it is suitable for the output of . For all points constituting the outer surface, correction may be performed using an average value of points around it.

For example, as schematically shown in Figure 5, the outer surface obtained from the scan data displayed in white corresponding to the matching surface of the tooth and the corrected outer surface displayed in yellow by correcting this for the severely bent part are compared. Looking at it, it can be seen that the curvature of the part with severe surface curvature was compensated by the correction algorithm to alleviate the curvature. In particular, the part that is gentle from the alveolar side to the occlusal side, such as each part indicated by the yellow arrow in the enlarged view on the right, will be 3D printed in the future. At the time of printing, it will be able to play a role of reinforcing the thickness and improving the output stability.

Second, as schematically shown in FIGS. 3 and 4 , a shape reduced by a set thickness, for example, approximately 0.6 mm, is created from the outer surface and set to the inner surface of the shell type temporary crown. It is preferable to apply an algorithm that shrinks by a set thickness based on the normal vector direction of surrounding pixels in the outer 3D surface data to generate the inner shape. For example, all points constituting the outer surface may be moved inward by a set thickness based on the normal vector to create new points, and then all of the new points may be connected to create the inner surface.

Third, as schematically shown in FIGS. 3 and 4 , a shoulder connecting the exposed ends of the outer and inner surfaces is set. The setting of the shoulder is made by connecting the exposed end line of the outer surface marked in blue and the exposed end line of the inner surface marked in red, that is, the corresponding point of each Boundary line and attaching them. It is desirable that

In order to improve the accuracy, it is possible to create a shoulder by, for example, making three-step planes and attaching them. That is, when connecting the corresponding boundary lines of the inner surface and the outer surface, as schematically shown in FIG. You can create a shoulder by connecting those planes.

Fourth, a single 3D image is created by combining the outer surface, inner surface, and shoulder previously individually set as a whole.

Finally, the automatic design of the shell-type temporary crown is completed by converting the 3D image and generating and saving a file for 3D output of the shell-type temporary crown, for example, as an stl file.

The 3D printing output unit 50 is a component that outputs and transmits a 3D output file designed in the automatic design unit 40 to a 3D printer to manufacture the shell-type temporary crown. Such output transmission may use various known wired or wireless methods.

Since the shell-type temporary crown is directly attached to the human body, it is harmless to the human body, for example, FDM type 3D printer using a filament containing polylactic acid (PLA) mainly of fermented vegetable starch (usually corn) as a material. It is preferable to use

Hereinafter, a method for automatically manufacturing a shell-type temporary crown according to an embodiment of the present invention will be briefly described with reference to the accompanying drawings, focusing on characteristic methods, excluding the contents described in relation to the automatic manufacturing device for the shell-type temporary crown above.

6 is a flowchart of a method for automatically manufacturing a shell-type temporary crown according to an embodiment of the present invention.

As shown in FIG. 6, the method for automatically manufacturing a shell-type temporary crown according to an embodiment of the present invention includes an input step (S100), an acquisition step (S200), a separation and extraction step (S300), an automatic design step (S400), and an output step (S500).

The first step is an input step (S100) of selecting and receiving a patient and a tooth to be treated of the patient. Identification of the patient can be identified by various identification codes currently used in dentistry, such as the patient's name and date of birth, and the patient's treatment target tooth can be easily identified using a tooth formula (tooth identification number).

The second step is an acquisition step (S200) of loading intraoral 3D scan data of the patient selected and input in the input step (S100), and the input step ( In S100), the patient's intraoral 3D scan data selected and input is loaded. The intraoral 3D scan data is preferably intraoral 3D scan data before performing a PREP operation to form an abutment tooth by thinly removing the outer surface of the tooth so that a crown can be placed and fixed.

The third step is a separation extraction step (S300) of performing segmentation for each tooth in the intraoral 3D scan data called in the acquisition step (S200) using an artificial intelligence segmentation model, and extracting and providing shape data of the tooth to be treated. )am. Before the preparation operation of the patient called in the acquisition step (S200), a tooth corresponding to the selected tooth formula is searched from the intraoral 3D scan data, and then segmentation data is extracted. In other words, only the 3D surface data of the outer surface of the tooth to which the crown is to be applied is separated and extracted.

In the separation and extraction step (S300), as shown exemplarily in FIG. 2, segmentation is performed for each tooth by utilizing an AI segmentation model from the acquired intraoral 3D scan data of the patient, and using a 3D mesh data tool It is preferable to include the step of separating data for each tooth separated by area from the 3D scan data of the whole oral cavity, storing it as a separate 3D Mesh data file, and extracting and providing only the outer surface shape data of the tooth to be treated selected from among them. do.

The fourth step is an automatic design step (S400) of automatically designing a file for 3D output by utilizing the shape data of the tooth to be treated so that a shell-type temporary crown can be manufactured through a 3D printer or the like.

The fifth and final step is an output step (S500) of transmitting the 3D output file to a 3D printer to manufacture a shell-type temporary crown.

The shell type temporary crown is automatically output using the automatically generated 3D output file in the automatic design step (S400). In this case, since it is attached to the human body, it is preferable to print with a FDM-type 3D printer with a filament containing polylactic acid (PLA), which is harmless to the human body, for example, mainly fermented vegetable starch (usually corn).

The shell-type temporary crown produced through the above steps is attached to the abutment tooth after a preparation operation by a dentist or the like. At this time, since the inner surface of the shell-type temporary crown manufactured as described above is arbitrarily designed according to an arbitrary set thickness, the outer shape of the cell-type temporary crown and the abutment do not exactly match, so supplementation is required. To this end, a material such as self-curing resin, which is also used when manually manufacturing temporary teeth, is filled on the inner surface of the cell-type temporary crown, and a process of fitting it so that there is no empty space may be performed.

In addition, the automatic shell-type temporary crown manufacturing program according to an embodiment of the present invention may be combined with a computer, which is hardware, and stored in a medium to execute the automatic manufacturing method of the shell-type temporary crown described above.

As such, steps of a manufacturing method or algorithm described in relation to an embodiment of the present invention may be directly implemented as hardware, implemented as a software module executed by hardware, or implemented by a combination thereof. A software module may include random access memory (RAM), read only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, hard disk, removable disk, CD-ROM, or It may reside in any form of computer readable recording medium well known in the art to which the present invention pertains.

Claims (11)

delete a selection input unit for selecting and receiving a patient and a tooth to be treated of the patient;
a scan data acquisition unit that reads intraoral 3D scan data of the patient selected and input to the selection input unit;
a segmentation and extraction unit performing segmentation for each tooth in the intraoral 3D scan data using an artificial intelligence (AI) segmentation model, and extracting and providing shape data of the tooth to be treated;
an automatic design unit that automatically designs a file for 3D output of a shell-type temporary crown by utilizing the shape data of the tooth to be treated; and
A 3D printing output unit for outputting and transmitting the 3D output file to a 3D printer; includes,
The intraoral 3D scan data is intraoral 3D scan data before performing a prep (PREP) operation, a shell-type temporary crown automatic manufacturing device.
The method of claim 2,
The segmentation and extraction unit performs segmentation for each tooth using an artificial intelligence segmentation model from the 3D scan data in the oral cavity, and separates the data for each tooth separated by area from the 3D scan data in the entire oral cavity and stores them as a 3D mesh data file. And an automatic shell-type temporary crown manufacturing apparatus for extracting and providing only the shape data of the tooth to be treated.
The method of claim 2,
The automatic design unit sets the outer surface of the shell-type temporary crown from the shape data of the tooth to be treated as the outer surface of the shell-type temporary crown, creates a shape reduced by a set thickness from the outer surface and sets it to the inner surface, and sets each of the outer and inner surfaces A shell-type temporary crown automatic manufacturing device that sets a shoulder connecting the exposed end, combines the outer surface, inner surface, and shoulder to create one 3D image, and converts the 3D image to create a file for 3D output.
The method of claim 4,
A shell-type temporary crown automatic manufacturing device that automatically compensates for the curvature of the surface by applying a data correction algorithm to the severely curved portion of the outer surface of the shell-type temporary crown.
A method for automatically manufacturing a shell-type temporary crown using the automatic shell-type temporary crown manufacturing device according to any one of claims 2 to 5,
an input step of selecting and receiving an input of a patient and a tooth to be treated of the patient;
an acquisition step of importing 3D scan data within the oral cavity of the patient selected and input in the input step;
A separation extraction step of performing segmentation for each tooth in the intraoral 3D scan data called in the acquisition step by using an artificial intelligence (AI) segmentation model, and extracting and providing shape data of the tooth to be treated;
an automatic design step of automatically designing a file for 3D output of a shell-type temporary crown by utilizing the shape data of the tooth to be treated; and
An output step of outputting and transmitting the 3D output file to a 3D printer; Including,
The intraoral 3D scan data is intraoral 3D scan data before performing a prep (PREP) operation, a shell-type temporary crown automatic manufacturing method.
delete The method of claim 6,
In the separation and extraction step, segmentation is performed for each tooth using an artificial intelligence segmentation model from the 3D scan data in the oral cavity, and data for each tooth separated by area is separated from the 3D scan data in the entire oral cavity and stored as a 3D mesh data file. and extracting and providing only the shape data of the tooth to be treated.
The method of claim 6,
In the automatic design step, the outer surface is set as the outer surface of the shell-type temporary crown from the shape data of the tooth to be treated, and a shape reduced by a set thickness is created from the outer surface and set as the inner surface, respectively. Setting a shoulder connecting the exposed end of the shell, combining the outer surface, the inner surface, and the shoulder to create a 3D image, and converting the 3D image to create a file for 3D output. Crown automatic manufacturing method.
The method of claim 9,
Automatically supplementing the curvature of the surface by applying a data correction algorithm to the severely curved portion of the outer surface of the shell-type temporary crown.
An automatic shell-type temporary crown manufacturing program combined with a hardware computer and stored in a medium to execute the automatic shell-type temporary crown manufacturing method according to claim 6.

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